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16.118 SBFM

Signed Bitfield Move.

This instruction is used by the aliases:

  • ASR (immediate).
  • SBFIZ.
  • SBFX.
  • SXTB.
  • SXTH.
  • SXTW.

Syntax

SBFM Wd, Wn, #immr, #imms ; 32-bit general registers

SBFM Xd, Xn, #immr, #imms ; 64-bit general registers

Where:

Wd

Is the 32-bit name of the general-purpose destination register.

Wn

Is the 32-bit name of the general-purpose source register.

immr

Depends on the instruction variant:

32-bit general registers

Is the right rotate amount, in the range 0 to 31.

64-bit general registers

Is the right rotate amount, in the range 0 to 63.

imms

Depends on the instruction variant:

32-bit general registers

Is the leftmost bit number to be moved from the source, in the range 0 to 31.

64-bit general registers

Is the leftmost bit number to be moved from the source, in the range 0 to 63.

Xd

Is the 64-bit name of the general-purpose destination register.

Xn

Is the 64-bit name of the general-purpose source register.

Usage

Signed Bitfield Move copies any number of low-order bits from a source register into the same number of adjacent bits at any position in the destination register, shifting in copies of the sign bit in the upper bits and zeros in the lower bits.

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